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Uncaught Cannot add undefined

timdt test
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Warning: Please note

This thread was started before GSAP 3 was released. Some information, especially the syntax, may be out of date for GSAP 3. Please see the GSAP 3 migration guide and release notes for more information about how to update the code to GSAP 3's syntax. 

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Uncaught Cannot add undefined into the timeline; it is not a tween, timeline, function, or string.


Hey guys, sooo  first time i am getting this. Cannot understand why.

My other documents work but with this i am suddenly getting this weird error.

Must be something i am overlooking.


Btw everything is in one file because i am making something for google adwords :)


Help would be very much appreciated.


Side question: 


item 1 from x-250 to 0 (center) fade out(opacity 0 )

item 2 from x-250 to 0 (center) fade out(opacity 0 )

item 3 from x-250 to 0 (center) fade out(opacity 0 )


Could this be achieved with stagger? and how?




See the Pen jGJBgV by timdt (@timdt) on CodePen

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Hello @timdtand welcome to the GreenSock forum!


This is happening due to not returning your timeline in your timelineone function. GSAP add() method expects a timeline being returned when you have a function.


So your missing this inside timelineone() fucntion


return tl;


And all together


function timelineone(){
	var tl = new TimelineMax();
 	return tl; // your missing this line


And now you can see your animation run

See the Pen gGExYd by jonathan (@jonathan) on CodePen


Checkout this CSS Tricks Article by the Mighty @Carl on how to write smarter animation code:





And this:



Happy Tweening! :)

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